How to prepare curve translate animation for android?

Question

There are 4 types of animations in android - rotate, alpha,scale and translate. I want to prepare curved translate animation.

Is it possible.?

Answer 1

Here are the animators I use:

Purpose: Move View "view" along Path "path"

Android v21+:

// Animates view changing x, y along path co-ordinates
ValueAnimator pathAnimator = ObjectAnimator.ofFloat(view, "x", "y", path)

Android v11+:

// Animates a float value from 0 to 1 
ValueAnimator pathAnimator = ValueAnimator.ofFloat(0.0f, 1.0f);

// This listener onAnimationUpdate will be called during every step in the animation
// Gets called every millisecond in my observation  
pathAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {

float[] point = new float[2];

@Override
    public void onAnimationUpdate(ValueAnimator animation) {
        // Gets the animated float fraction
        float val = animation.getAnimatedFraction();

        // Gets the point at the fractional path length  
        PathMeasure pathMeasure = new PathMeasure(path, true);
        pathMeasure.getPosTan(pathMeasure.getLength() * val, point, null);

        // Sets view location to the above point
        view.setX(point[0]);
        view.setY(point[1]);
    }
});

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